컴퓨터 활용 과 실습1


                  Component



/*
<html>
<head><title>Button 생성과 이벤트 처리</title></head>
<body>
  <applet code="ButtonGandE" width=450 height=60>
  </applet>
</body>
</html>
*/

import java.applet.*;
import java.awt.*;
import java.awt.event.*;

public class ButtonGandE extends Applet implements ActionListener {
  Label label;
  String msg = "";

  public void init() {
    Button b1 = new Button("봄");
    b1.addActionListener(this);
    add(b1);
    Button b2 = new Button("여름");
    b2.addActionListener(this);
    add(b2);
    Button b3 = new Button("가을");
    b3.addActionListener(this);
    add(b3);
    Button b4 = new Button("겨울");
    b4.addActionListener(this);
    add(b4);
    label = new Label("     ");
    add(label);
  }

  public void actionPerformed(ActionEvent ae) {
    label.setText(ae.getActionCommand());
    repaint();
    }

  public void paint(Graphics g) {
    msg = "계절버튼을 눌러주세요 ";
    g.drawString(msg,1, 22);
  }
}
<html>
<head><title>Canvas 객체의 생성</title></head>
<body>
  <applet code="CanvasGen" width=300 height=300>
  </applet>
</applet>
</body>
</html>
*/
import java.applet.*;
import java.awt.*;

class MyCanvas1 extends Canvas {

  public void paint(Graphics g) {

    g.drawLine(10, 10, 100, 10);
    g.drawLine(100, 10, 100, 100);
    g.drawLine(100, 100, 10, 100);
    g.drawLine(10, 100, 10, 10);
    g.drawLine(10, 10, 100, 100);
    g.drawLine(10, 100, 100, 10);
  }
}

class MyCanvas2 extends Canvas {

  public void paint(Graphics g) {

    g.setColor(Color.green);
    g.drawRect(10, 10, 100, 100);
    g.fillRect(120, 10, 100, 100);
  }
}


public class CanvasGen extends Applet {
  public void init() {
    MyCanvas1 myCanvas1 = new MyCanvas1();
    myCanvas1.setSize(250, 120);
    add(myCanvas1);
    MyCanvas2 myCanvas2 = new MyCanvas2();
    myCanvas2.setSize(250, 120);
    add(myCanvas2);
  }
}
/*
<html>
<head><title>Checkbox 생성과 이벤트 처리</title></head>
<body>
  <applet code="CheckboxGandE" width=300 height=180>
  </applet>
</body>
</html>
*/

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class CheckboxGandE extends Applet implements ItemListener {
  String msg = "";
  Checkbox apple, banana, orange, grape;
 
   public void init() {
    apple = new Checkbox("사과", null, true);
    banana = new Checkbox("바나나");
    orange = new Checkbox("오렌지");
    grape = new Checkbox("포도");

    add(apple);
    add(banana);
    add(orange);
    add(grape);

    apple.addItemListener(this);
    banana.addItemListener(this);
    orange.addItemListener(this);
    grape.addItemListener(this);
    // 각각의 Checkbox 객체에 리스너를 등록
  }

  public void itemStateChanged(ItemEvent ie) {
    repaint();
    // 체크박스에서 이벤트가 발생하면 paint() 호출
  }

  public void paint(Graphics g) {
    msg = "  사  과  : " + apple.getState();
    // getState() 메소드를 이용하여 객체의 상태를 출력
    g.drawString(msg, 36, 80);
    msg = "  포  도  : " + grape.getState();    
    g.drawString(msg, 36, 100);    
    msg = "  바나나  : " + banana.getState();
    g.drawString(msg, 36, 120);
    msg = "  오렌지  : " + orange.getState();    
    g.drawString(msg, 36, 140);
    }
}

/*
<html>
<head><title>CheckboxGroup 객체 생성과 이벤트 처리</title></head>
<body>
  <applet code="CBGroupGandE" width=250 height=150>
  </applet>
</body>
</html>
*/
import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class CBGroupGandE extends Applet implements ItemListener {
  String msg = "";
  Checkbox win95, winNT, solaris, mac, rinux;
  CheckboxGroup cbg;
  Label la1;

  public void init() {
    cbg = new CheckboxGroup();

    la1 = new Label("사용하고 계신 운영체제를 선택하세요");
    win95 = new Checkbox("Windows 95", cbg, true);
    winNT = new Checkbox("Windows NT", cbg, false);
    solaris = new Checkbox("Solaris", cbg, false);
    mac = new Checkbox("MacOS", cbg, false);
    rinux = new Checkbox("Rinux",cbg, false);

    add(la1);
    add(win95);
    add(winNT);
    add(solaris);
    add(mac);
    add(rinux);

    win95.addItemListener(this);
    winNT.addItemListener(this);
    solaris.addItemListener(this);
    mac.addItemListener(this);
    rinux.addItemListener(this);
  }

  public void itemStateChanged(ItemEvent ie) {
    repaint();
  }

  public void paint(Graphics g) {
    msg = "선택한 운영체제 : ";
    msg += cbg.getSelectedCheckbox().getLabel();
    g.drawString(msg, 20, 120);
  }
}
/*
<html>
<head><title>Choice 생성과 이벤트 처리</title></head>
<body>
<applet code="ChoiceGandE" width=300 height=180>
</applet>
</body>
</html>
*/

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class ChoiceGandE extends Applet implements ItemListener {
  Choice air, city;
  String msg = "";

  public void init() {
    air = new Choice();
    city = new Choice();
    
    air.add("대한항공");
    air.add("아시아나");

    city.add("여수");
    city.add("부산");
    city.add("제주");
    city.add("광주");
    city.add("대구");
    city.add("서울");

    add(air);
    add(city);

    air.addItemListener(this);
    city.addItemListener(this);
  }

  public void itemStateChanged(ItemEvent ie) {
    repaint();
  }

  public void paint(Graphics g) {
    msg = "Choice를 이용한 항공사 선택 : ";
    msg += air.getSelectedItem();
    g.drawString(msg, 6, 120);
    msg = "Choice를 이용한 지역 선택 : ";
    msg += city.getSelectedItem();
    g.drawString(msg, 6, 140);
  }
}